National regulations are relaxed to 80W, wireless charging for mobile phones is finally rolled up! Apple was shot first

In other words, when you wake up, Android manufacturers may be able to smile for a while, but Apple users may have to cry for a while?

Starting today, the "Interim Regulations on Radio Management of Wireless Charging (Power Transmission) Equipment" issued by the Ministry of Industry and Information Technology last year will be officially implemented.

The main changes are:

The frequency of wireless charging equipment is specified in three frequency bands: 100-148.5kHz, 6765-6795kHz, and 13553-13567kHz, and the maximum wireless charging power is changed from the original The 50W has been increased to 80W today.

To put it simply, our mobile phones can be charged faster wirelessly.

You may have also discovered that the Android camp has increased the wired charging power of mobile phones to 240w in recent years. There are almost no names like flash charging, second charging, and extreme charging.

But in the field of wireless charging next door, everyone is a good friend walking hand in hand. It’s only 50W, and no one can get more.

But don’t think that this is a mobile phone manufacturer that has set aside an absolute area.

In fact, this is because in 2021, the "Interim Regulations on Radio Management of Wireless Charging (Power Transmission) Equipment (Draft for Comment)" published by the Ministry of Industry and Information Technology clearly stipulates that the wireless charging power of mobile phones must be less than 50W.

This paper regulation has put a tight curse on the monkey of wireless fast charging. Until now, wireless charging of Android phones has always been locked in 50W, and everyone can’t roll it out. Come up with tricks.

Now that the regulations are relaxed, don’t Android manufacturers just have to increase their budgets with a smile?

But in this case, Apple became the rebel.

In the wireless charging equipment statement on Apple’s official website, it has silently changed the power and frequency from 15W and 360kHz to the original 7.5W and 127.7kHz.

In order to get rid of the suspicion of violating the rules, they even specifically stated that this was in compliance with relevant national standards.

In fact, Tony was confused when he saw this regulation at first. Why had wireless charging power been restricted before? Why is Apple's version weakened?

After some research, we found that we have to start with the history and principles of wireless charging.

Although wireless charging looks like a cool feature, it is actually not new at all.

As early as 1894, M. Hutin and M. Le-Blanc proposed a wireless charging method, but they were mainly used to charge early electric cars.

M.Hutin and M.Le-Blanc proposed a design for wireless charging of trams

In 2009, the first mobile phone to support wireless charging, the Palm Pre Mobile phones are already on the market.

The first domestic user of wireless charging was the M7 Plus released by Gionee in 2017, but wireless charging really became well-known by Apple in 2020. iPhone 12.

The Magsafe function brought by Apple at that time not only increased the wireless charging power to 15W, but also solved the pain point of past wireless charging that could not be charged while playing through magnetic suction, making wireless charging of mobile phones more convenient. The attention of many people.

Nowadays, Xiaomi and Honor have mastered hundreds of watts of wireless charging technology.

But in the final analysis, mainstream wireless charging is basically electromagnetic induction.

Its principle is very simple. As the name suggests, it relies on the principle of electromagnetic induction discovered by Faraday, that is, magnetic energy generates electricity and electric energy generates magnetism.

Then the input electricity generates magnetism, and then the magnet generates electricity to charge the device. In this way, wireless charging can be achieved.

Putting it on a mobile phone means installing a transmitting coil on the wireless charging base and a receiving coil on the back of the mobile phone.

Charge and start!

The transmitting coil uses external alternating current to generate an alternating magnetic field.

The change in the magnetic field causes the receiving coil in the mobile phone to become noisy, thus generating an induced current, which can transmit electricity to the mobile phone battery through the air.

Speaking of this, if you are smart, you will know just by patting your thigh. This kind of transmission of electricity through the air is like diagnosing the pulse with a suspended thread. It may look awesome, but it may actually be nothing.

After all, there must be a lot of consumption between two different energy conversions.

Fortunately, Tesla discovered the phenomenon of resonant inductive coupling: two systems at the same frequency can exchange energy more effectively.

In other words, if the frequencies of the two systems of the charger and the charging equipment match, they can transmit energy efficiently.

So with people’s continuous adjustments and attempts, electromagnetic induction charging can now achieve an efficiency of more than 80%, which is not comparable to wired charging, but at least it is enough.

But as more and more wireless charging are used, co-channel interference gradually increases.

To put it simply, co-channel interference means that if different wireless signals have the same frequency, they will interfere with each other.

Wireless chargers using electromagnetic induction charging will generate a lot of radio waves.

As a simple example, if you are at a party and many people in the room are talking at the same time, it will be difficult for you to hear your friends clearly.

So if everyone produces wireless charging equipment at will, there will be a lot of problems if everyone interferes with each other.

At a mild level, the harm may be complaining every day "Why is the signal so bad today?"; at a serious level, it may even affect aircraft navigation and other issues.

So in 2021, the Ministry of Industry and Information Technology announced the "Interim Regulations on Radio Management of Wireless Charging (Power Transmission) Equipment (Draft for Comments)", which stipulated the frequency of wireless charging equipment and initially restricted the wild growth of the industry.

It was only last year that the "Interim Regulations on Radio Management of Wireless Charging (Power Transmission) Equipment" were passed to truly clearly divide everyone's frequency range.

In this regulation, the frequency band 325kHz-405kHz is allocated to the aeronautical radio navigation business.

But we found that in fact, this regulation does not affect everyone’s daily use.

Because in the early days of the development of wireless charging, in order to further allow everyone’s wireless charging equipment to adapt to each other, there were a bunch of wireless charging standard formulations.

The most famous of them is the Wireless Power Consortium, which launched the Qi standard in 2010.

This Qi standard mainly meets the requirements for wireless charging of 5W or smaller mobile terminals. After Samsung and Apple successively joined the Qi standard, it has also become an internationally accepted wireless charging standard.

It can be said that the Qi standard is currently the only public wireless charging standard widely recognized in the world.

WPC In order to ensure adaptability to more manufacturers, the Qi standard adopted the electromagnetic wave frequency of 100-205kHz at the beginning of its design, which has strong compatibility and high transmission efficiency.

And this frequency band is not on the same channel as most wireless devices, so interference problems are avoided to the greatest extent.

It’s just a bit unlucky for Apple that they just joined the Qi2.0 standard launched by WPC last year (the one used on iPhone 15).

The biggest highlight of this Qi2.0 standard is the addition of MPP (Magnetic PowerProfile Magnetic Power Protocol).

In this way, as long as the product is Qi2.0 certified, it can be charged with one stick just like an iPhone paired with a MagSafe charger.

But the problem also occurs in MPP. Its addition changes the working frequency of Qi2.0 to 360kHz, which happens to hit the aviation radio navigation allocated by our country last year. business.

So looking at it this way, it can only be said that Qi2.0 is a bit untimely.

But don’t worry too much. The official has made it clear that whether it is Qi2 of iPhone15 or MagSafe of previous iPhones, you can still use it, but you can’t buy it if you don’t buy it.

Furthermore, Tony checked and found that as of July 5, 2023, nearly half of WPC members are Chinese manufacturers. Maybe Qi2.0 will be adjusted soon Working frequency, the impact can be eliminated quickly.

No matter what happens, Qi standard wireless charging is not unusable.

Although wireless charging is developing rapidly, there are still problems such as charging heating. Until these problems are solved, it is not necessarily a good thing to blindly use wireless fast charging.

Let me take a step back and ask, is there really anyone who can charge wirelessly faster?

In the final analysis, we have gradually relaxed the power restrictions and clarified the frequency range, and everyone finally has a clear direction of volume.

Although Android manufacturers may be more happy and Apple is a little embarrassed for the time being, in the long run, as long as both parties invest in research and development, future users will definitely be smiling.

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